<template>
  <div class="upload-file">
    <el-upload
      ref="upload"
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="1"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
    >
      <!-- 上传按钮 -->
      <el-button size="mini" type="primary">
        选取文件
      </el-button>
      <!-- 上传提示 -->
      <div v-if="showTip" slot="tip" class="el-upload__tip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <li v-for="(file, index) in list" :key="file.uid" class="el-upload-list__item ele-upload-list__item-content">
        <el-link :href="file.url" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :underline="false" type="danger" @click="handleDelete(index)">
            删除
          </el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth'
import {upfileURL,imgURL} from '@/api'
export default {
    props: {
        // 值
        value: [String, Object, Array],
        // 大小限制(MB)
        fileSize: {
            type: Number,
            default: 5
        },
        // 文件类型, 例如['png', 'jpg', 'jpeg']
        fileType: {
            type: Array,
            default: () => ['doc', 'xls', 'ppt', 'txt', 'pdf']
        },
        // 是否显示提示
        isShowTip: {
            type: Boolean,
            default: true
        }
    },
    data() {
        return {
          baseUrl: imgURL,
          uploadFileUrl: upfileURL + "/api/file/upload", // 上传的图片服务器地址
          headers: {
            Authorization: 'Bearer ' + getToken()
          },
          fileList: []
        }
    },
    computed: {
        // 是否显示提示
        showTip() {
            return this.isShowTip && (this.fileType || this.fileSize)
        },
        // 列表
        list() {
            let temp = 1
            if (this.value) {
                // 首先将值转为数组
                const list = Array.isArray(this.value) ? this.value : [this.value]
                // 然后将数组转为对象数组
                return list.map(item => {
                    if (typeof item === 'string') {
                        item = { name: item, url: item }
                    }
                    item.uid = item.uid || new Date().getTime() + temp++
                    return item
                })
            } else {
                // eslint-disable-next-line vue/no-side-effects-in-computed-properties
                this.fileList = []
                return []
            }
        }
    },
    created() {
        this.fileList = this.list
    },
    methods: {
        // 上传前校检格式和大小
        handleBeforeUpload(file) {
            // 校检文件类型
            if (this.fileType) {
                let fileExtension = ''
                if (file.name.lastIndexOf('.') > -1) {
                    fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
                }
                const isTypeOk = this.fileType.some(type => {
                    if (file.type.indexOf(type) > -1) return true
                    if (fileExtension && fileExtension.indexOf(type) > -1) return true
                    return false
                })
                if (!isTypeOk) {
                    this.$message.error(`文件格式不正确, 请上传${this.fileType.join('/')}格式文件!`)
                    return false
                }
            }
            // 校检文件大小
            if (this.fileSize) {
                const isLt = file.size / 1024 / 1024 < this.fileSize
                if (!isLt) {
                    this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`)
                    return false
                }
            }
          this.$modal.loading("正在上传文件，请稍候...");
            return true

        },
        // 文件个数超出
        handleExceed() {
            this.$message.error('只允许上传单个文件')
        },
        // 上传失败
        handleUploadError(err) {
            this.$message.error('上传失败, 请重试')
        },
        // 上传成功回调
        handleUploadSuccess(res, file) {
            this.$message.success('上传成功')
          // console.log(res)
            this.$emit('input', this.baseUrl+res.data.uri)
          this.$modal.closeLoading();
        },
        // 删除文件
        handleDelete(index) {
            this.fileList.splice(index, 1)
            this.$emit('input', '')
        },
        // 获取文件名称
        getFileName(name) {
            if (name.lastIndexOf('/') > -1) {
                return name.slice(name.lastIndexOf('/') + 1).toLowerCase()
            } else {
                return ''
            }
        },
    }
}
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
